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Diffstat (limited to 'Documentation/watchdog/wdt.txt')
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diff --git a/Documentation/watchdog/wdt.txt b/Documentation/watchdog/wdt.txt deleted file mode 100644 index ed2f0b860869..000000000000 --- a/Documentation/watchdog/wdt.txt +++ /dev/null @@ -1,50 +0,0 @@ -Last Reviewed: 10/05/2007 - - WDT Watchdog Timer Interfaces For The Linux Operating System - Alan Cox <alan@lxorguk.ukuu.org.uk> - - ICS WDT501-P - ICS WDT501-P (no fan tachometer) - ICS WDT500-P - -All the interfaces provide /dev/watchdog, which when open must be written -to within a timeout or the machine will reboot. Each write delays the reboot -time another timeout. In the case of the software watchdog the ability to -reboot will depend on the state of the machines and interrupts. The hardware -boards physically pull the machine down off their own onboard timers and -will reboot from almost anything. - -A second temperature monitoring interface is available on the WDT501P cards. -This provides /dev/temperature. This is the machine internal temperature in -degrees Fahrenheit. Each read returns a single byte giving the temperature. - -The third interface logs kernel messages on additional alert events. - -The ICS ISA-bus wdt card cannot be safely probed for. Instead you need to -pass IO address and IRQ boot parameters. E.g.: - wdt.io=0x240 wdt.irq=11 - -Other "wdt" driver parameters are: - heartbeat Watchdog heartbeat in seconds (default 60) - nowayout Watchdog cannot be stopped once started (kernel - build parameter) - tachometer WDT501-P Fan Tachometer support (0=disable, default=0) - type WDT501-P Card type (500 or 501, default=500) - -Features --------- - WDT501P WDT500P -Reboot Timer X X -External Reboot X X -I/O Port Monitor o o -Temperature X o -Fan Speed X o -Power Under X o -Power Over X o -Overheat X o - -The external event interfaces on the WDT boards are not currently supported. -Minor numbers are however allocated for it. - - -Example Watchdog Driver: see samples/watchdog/watchdog-simple.c |